Selenia dentaria
In 3 days ~10% in a week ~30%
Selenia dentaria, the early thorn, is a moth of the family Geometridae. It is found in Northern Europe, and across the Palearctic to the Caucasus, Transcaucasia, North Siberia, Russian Far East, Amur and Mongolia. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Snowdonia National Park | 🇬🇧 United Kingdom | |
| 2 | Wadden Sea National Park | 🇩🇪 Germany | |
| 3 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 4 | Pyrénées National Park | 🇫🇷 France |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Porto | 🇵🇹 Portugal | |
| 2 | Manchester | 🇬🇧 United Kingdom | |
| 3 | Liverpool | 🇬🇧 United Kingdom | |
| 4 | Birmingham | 🇬🇧 United Kingdom | |
| 5 | London | 🇬🇧 United Kingdom | |
| 6 | Leeds | 🇬🇧 United Kingdom | |
| 7 | Copenhagen | 🇩🇰 Denmark |
Rare
Under 5% of wildlife watchers report an Early Thorn sighting in Pyrénées National Park on a given day, based on 18 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 610th most-seen of the 1277 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
April to June
In those months about 10% of wildlife watchers report an Early Thorn in Pyrénées National Park on a given day, against under 5% in July to March, the lowest months.
Between 11 pm and 2 am
Across all the parks we cover, that three-hour window holds the most Early Thorn sightings with a recorded time, and about half of them come between 6 pm and 6 am: it is seen both by day and at night.
4th of 4
Of the 4 parks where we can rate Early Thorn sightings, Pyrénées National Park ranks 4th at under 5%. The best odds are in Snowdonia National Park (United Kingdom, about 20%), Wadden Sea National Park (Germany, about 10%) and Bavarian Forest National Park (Germany, about 10%).
GBIF citizen-science records
It is estimated from how often the Early Thorn is recorded against all the insects logged in Pyrénées National Park (18 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
